refactor: 更新 Menu 透明样式

Author: ArgoZhang

src/BootstrapBlazor/Components/Menu/Menu.razor.scss

@@ -103,7 +103,8 @@
     overflow: hidden;
     vertical-align: top;
     display: inline-block;
-    transition: width .3s linear;
+    opacity: 1;
+    transition: opacity .3s linear;
 }
 
 .menu .nav .nav-link .menu-text {
@@ -207,3 +208,9 @@
 .menu.is-bottom .dropdown-menu-arrow:after {
     content: none;
 }
+
+@media (min-width: 768px) {
+    .is-collapsed .menu .menu-text {
+        opacity: 0;
+    }
+}